if __name__ == '__main__':
    print()
else:
    print("I am mymoudloe.py，let`s dance!")
    
def main():
    n = eval(input("请输入n:"))
    print(fibo(n))
def fibo(n):
    if n==0:
        return ""
    elif n==1 or n==2:
        
        return 1
    else:        
        return (fibo(n-1) + fibo(n-2))
        
        
main()
